<template>
  <div>
    <el-switch
      v-model="draggable"
      active-text="开启拖拽"
      inactive-text="关闭拖拽"
    ></el-switch>
    <el-button v-if="draggable" @click="batchSave">批量保存</el-button>
    <el-button type="danger" @click="batchDelete">批量删除</el-button>
    <el-tree
      :data="menus"
      :props="defaultProps"
      :expand-on-click-node="false"
      show-checkbox
      node-key="catId"
      :default-expanded-keys="expandedKeys"
      :draggable="draggable"
      :allow-drop="allowDrop"
      @node-drop="handleDrop"
      ref="categoryTree"
    >
      <span class="custom-tree-node" slot-scope="{ node, data }">
        <span>{{ node.label }}</span>
        <span>
          <el-button
            v-if="node.level <= 2"
            type="text"
            size="mini"
            @click="() => append(data)"
          >
            新增
          </el-button>
          <el-button type="text" size="mini" @click="edit(data)">
            修改
          </el-button>
          <el-button
            v-if="node.childNodes.length == 0"
            type="text"
            size="mini"
            @click="() => remove(node, data)"
          >
            删除
          </el-button>
        </span>
      </span>
    </el-tree>
    <el-dialog
      :title="dialogTitle"
      :visible.sync="dialogVisible"
      width="30%"
      :close-on-click-modal="false"
    >
      <el-form :model="category">
        <el-form-item label="分类名称">
          <el-input v-model="category.name" autocomplete="off"></el-input>
        </el-form-item>
        <el-form-item label="图标">
          <el-input v-model="category.icon" autocomplete="off"></el-input>
        </el-form-item>
        <el-form-item label="计量单位">
          <el-input
            v-model="category.productUnit"
            autocomplete="off"
          ></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="dialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="submitData()">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      pCid: [],
      draggable: false,
      updateNodes: [],
      maxLevel: 0,
      category: {
        name: "",
        parentCid: 0,
        catLevel: 0,
        showStatus: 1,
        sort: 0,
        productUnit: "",
        icon: "",
        catId: null,
      },
      dialogTitle: "",
      dialogType: "",
      dialogVisible: false,
      menus: [],
      expandedKeys: [],
      defaultProps: {
        children: "children",
        label: "name",
      },
    };
  },
  activated() {
    this.getDataList();
  },
  methods: {
    batchDelete() {
      let catIds = [];
      let checkNodes = this.$refs.categoryTree.getCheckedNodes();
      for (let i = 0; i < checkNodes.length; i++) {
        catIds.push(checkNodes[i].catId);
      }

      this.$confirm(`是否批量删除选中分类?`, "提示", {
        confirmButtonText: "确定",
        cancelButtonText: "取消",
        type: "warning",
      })
        .then(() => {
          this.$http({
            url: this.$http.adornUrl("/product/category/delete"),
            method: "post",
            data: this.$http.adornData(catIds, false),
          }).then(({ data }) => {
            this.$message({
              message: "操作成功",
              type: "success",
              duration: 1500,
              onClose: () => {
                this.getDataList();
                //设置默认要展开的菜单
                // this.expandedKeys = [node.parent.data.catId];
              },
            });
          });
        })
        .catch(() => {});
    },
    batchSave() {
      //保存数据
      this.$http({
        url: this.$http.adornUrl("/product/category/update/batch"),
        method: "post",
        data: this.$http.adornData(this.updateNodes, false),
      }).then(({ data }) => {
        this.$message({
          message: "操作成功",
          type: "success",
          duration: 1500,
          onClose: () => {
            this.getDataList();
            //设置默认要展开的菜单
            this.expandedKeys = this.pCid;
            this.updateNodes = [];
            this.maxLevel = 0;
            // this.pCid = 0;
          },
        });
      });
    },
    /**
     * 拖拽成功触发事件
     */
    handleDrop(draggingNode, dropNode, dropType, ev) {
      console.log("handleDrop: ", draggingNode, dropNode, dropType);
      //1、当前节点最新的父节点ID
      let pCid = 0;
      let siblings = null;
      if (dropType == "before" || dropType == "after") {
        pCid =
          dropNode.parent.data.catId == undefined
            ? 0
            : dropNode.parent.data.catId;
        siblings = dropNode.parent.childNodes;
      } else {
        pCid = dropNode.data.catId;
        siblings = dropNode.childNodes;
      }
      this.pCid.push(pCid);

      //2、当前拖拽节点的最新顺序
      for (let i = 0; i < siblings.length; i++) {
        if (siblings[i].data.catId == draggingNode.data.catId) {
          let catLevel = draggingNode.level;
          if (siblings[i].level != draggingNode.level) {
            //当前节点的层级发生变化
            catLevel = siblings[i].level;
            //修改他子节点的层级
            this.updateChildNodeLevel(siblings[i]);
          }

          this.updateNodes.push({
            catId: siblings[i].data.catId,
            sort: i,
            parentCid: pCid,
            catLevel: catLevel,
          });
        } else {
          this.updateNodes.push({
            catId: siblings[i].data.catId,
            sort: i,
          });
        }
      }

      //3、当前拖拽节点的最新层级
    },
    /**
     * 修改子节点的层级
     */
    updateChildNodeLevel(node) {
      if (node.childNodes.length > 0) {
        for (let i = 0; i < node.childNodes.length; i++) {
          var cNode = node.childNodes[i].data;
          this.updateNodes.push({
            catId: cNode.catId,
            catLevel: node.childNodes[i].level,
          });
          this.updateChildNodeLevel(node.childNodes[i]);
        }
      }
    },
    /**
     * 节点是否允许被拖拽
     */
    allowDrop(draggingNode, dropNode, type) {
      //被拖动当前节点以及所在父节点总层级不能大于3
      //1）被拖动的当前节点总层数
      this.countNodeLevel(draggingNode);
      let deep = Math.abs(this.maxLevel - draggingNode.level) + 1;
      //2）所在父节点总层数
      if (type == "inner") {
        return deep + dropNode.level <= 3;
      } else {
        return deep + dropNode.parent.level <= 3;
      }
    },
    countNodeLevel(node) {
      if (node.childNodes != null && node.childNodes.length > 0) {
        for (let i = 0; i < node.childNodes.length; i++) {
          if (node.childNodes[i].level > this.maxLevel) {
            this.maxLevel = node.childNodes[i].level;
          }
          this.countNodeLevel(node.childNodes[i]);
        }
      }
    },
    edit(data) {
      this.dialogType = "edit";
      this.dialogTitle = "修改分类";
      this.dialogVisible = true;

      //查出最新数据
      this.$http({
        url: this.$http.adornUrl(`/product/category/info/${data.catId}`),
        method: "get",
      }).then(({ data }) => {
        this.category.name = data.data.name;
        this.category.catId = data.data.catId;
        this.category.productUnit = data.data.productUnit;
        this.category.icon = data.data.icon;
        this.category.parentCid = data.data.parentCid;
      });
    },
    append(data) {
      this.dialogType = "add";
      this.dialogTitle = "新增分类";
      this.dialogVisible = true;
      this.category.parentCid = data.catId;
      this.category.catLevel = data.catLevel * 1 + 1;

      this.category.name = "";
      this.category.catId = null;
      this.category.productUnit = "";
      this.category.icon = "";
    },
    submitData() {
      if (this.dialogType == "add") {
        this.addCategory();
      } else if (this.dialogType == "edit") {
        this.editCategory();
      }
    },
    editCategory() {
      var { catId, name, productUnit, icon } = this.category;
      this.$http({
        url: this.$http.adornUrl("/product/category/update"),
        method: "post",
        data: this.$http.adornData({ catId, name, productUnit, icon }, false),
      }).then(({ data }) => {
        this.$message({
          message: "操作成功",
          type: "success",
          duration: 1500,
          onClose: () => {
            this.dialogVisible = false;
            this.getDataList();
            //设置默认要展开的菜单
            this.expandedKeys = [this.category.parentCid];
          },
        });
      });
    },
    addCategory() {
      //增加子分类弹窗确定按钮
      this.$http({
        url: this.$http.adornUrl("/product/category/save"),
        method: "post",
        data: this.$http.adornData(this.category, false),
      }).then(({ data }) => {
        this.$message({
          message: "操作成功",
          type: "success",
          duration: 1500,
          onClose: () => {
            this.dialogVisible = false;
            this.getDataList();
            //设置默认要展开的菜单
            this.expandedKeys = [this.category.parentCid];
          },
        });
      });
    },
    remove(node, data) {
      var ids = [data.catId];

      this.$confirm(`是否删除[${data.name}]分类?`, "提示", {
        confirmButtonText: "确定",
        cancelButtonText: "取消",
        type: "warning",
      })
        .then(() => {
          this.$http({
            url: this.$http.adornUrl("/product/category/delete"),
            method: "post",
            data: this.$http.adornData(ids, false),
          }).then(({ data }) => {
            this.$message({
              message: "操作成功",
              type: "success",
              duration: 1500,
              onClose: () => {
                this.getDataList();
                //设置默认要展开的菜单
                this.expandedKeys = [node.parent.data.catId];
              },
            });
          });
        })
        .catch(() => {});
    },
    getDataList() {
      this.$http({
        url: this.$http.adornUrl("/product/category/list/tree"),
        method: "get",
      }).then(({ data }) => {
        this.menus = data.data;
      });
    },
  },
};
</script>

